Westlake Pipe Fittings dwv-d117-422 Dwv Adapter Coupling

Product Description

The WESTLAKE PIPE FITTINGS dwv-d117-422 is a Schedule 40 PVC DWV adapter coupling designed to connect a 4-inch hub end to a 3-inch spigot end in drain, waste, and vent piping systems. Molded from PVC, this fitting provides a reliable, solvent-weld connection between two different pipe diameters without the need for additional reducers or specialty fittings. It is sized at 4 inches by 3 inches nominal and conforms to standard DWV dimensions. Licensed plumbers and pipe fitters install this coupling during new construction or retrofit work where a smooth transition between pipe sizes is required in a gravity-flow drainage system.

This adapter coupling is suited for residential and light commercial DWV applications including sanitary drain lines, waste stacks, and vent piping. The hub-to-spigot configuration allows it to slip directly onto a 3-inch spigot-end pipe while accepting a 4-inch hub connection on the opposing end. It is commonly installed in under-slab runs, in-wall drain lines, and above-ceiling vent assemblies where a reduction from a 4-inch main to a 3-inch branch or offset is needed.

Key Features

• Adapts 4-inch DWV hub to 3-inch spigot end in a single fitting
• Schedule 40 PVC construction for standard DWV service
• Designed specifically for drain, waste, and vent applications
• Solvent-weld joint for a permanent, leak-resistant connection
• Nominal 4 x 3 inch sizing matches standard DWV pipe dimensions

Compatibility

Designed as an OEM-style replacement and standard-service fitting for Schedule 40 PVC DWV piping systems using 4-inch and 3-inch nominal pipe sizes.

Installation Notes

Installation should be performed by a licensed plumber in accordance with applicable plumbing codes such as the IPC or UPC. Clean and deburr both pipe ends before applying PVC primer and solvent cement per the cement manufacturer instructions. Ensure proper pipe alignment before the cement sets, as PVC solvent welds cure quickly and are not adjustable after assembly. Turn off all water supply and verify the drain line is depressurized before cutting into an existing system.

Technical Specifications

• Nominal Pipe Size: 4 x 3 inches
• Material: PVC
• Schedule: 40
• Application: Drain, Waste, Vent (DWV)
• Connection Type: Hub x Spigot
• UNSPSC Code: 40172608

Standard Information

• Brand: WESTLAKE PIPE FITTINGS
• Manufacturer Part Number: dwv-d117-422